My Kolar SC is factory ported.
Looks fine.
Scientifically does not reduce Total Recoil.
Does reduce muzzle jump. My Kolar just sits in your hands and there is barely any visible muzzle jump as I watch my son shoot it (he REALLY like the gun). Watching other non-ported O/U's, I can readily see the difference.
I have no problems with wind or noise or whatever.
I would shoot the gun in question and form you own opinion.-Dick